![]() Narcotics, whether prescribed or illicit, can do the same. Miosis can also be caused by medication side effects.Ĭertain medications for anxiety, muscle spasms and seizures, such as diazepam (Valium) and antihistamines like diphenhydramine (Benadryl), can cause the pupils to shrink. This can occur due to an eye injury or could also be due to a condition known as uveitis, which causes swelling in the iris and the tissues around it. Swelling inside the eye can make it difficult for the pupils to expand. It may be more difficult to see at night as a result. The muscles that control the pupils can become weak, making it difficult to open them. In old age, the pupils begin to shrink as well. It’s usual for a newborn’s pupils to remain small for roughly two weeks so that their eyes are shielded from strong light. There are many causes of pupils shrinking in size: Age This condition is known as abnormal miosis, and it can affect one or both eyes. If your pupils remain small even in dim light, it could indicate that something in your eye isn’t operating properly. Miosis is a condition where your pupil shrinks or constricts in size. It enlarges to let in more light while you’re in dim light and shrinks to protect your eye and keep light out while you’re in bright light. It grows and shrinks thousands of times per day. Your pupil is the dark circle in the center of your eye. With miosis, the pupils are less than 2mm. Normal pupils are usually 4-6 mm in diameter in room lighting. ![]()
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